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Linux/arch/unicore32/mm/init.c

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  1 /*
  2  *  linux/arch/unicore32/mm/init.c
  3  *
  4  *  Copyright (C) 2010 GUAN Xue-tao
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #include <linux/kernel.h>
 11 #include <linux/errno.h>
 12 #include <linux/swap.h>
 13 #include <linux/init.h>
 14 #include <linux/bootmem.h>
 15 #include <linux/mman.h>
 16 #include <linux/nodemask.h>
 17 #include <linux/initrd.h>
 18 #include <linux/highmem.h>
 19 #include <linux/gfp.h>
 20 #include <linux/memblock.h>
 21 #include <linux/sort.h>
 22 #include <linux/dma-mapping.h>
 23 #include <linux/export.h>
 24 
 25 #include <asm/sections.h>
 26 #include <asm/setup.h>
 27 #include <asm/sizes.h>
 28 #include <asm/tlb.h>
 29 #include <asm/memblock.h>
 30 #include <mach/map.h>
 31 
 32 #include "mm.h"
 33 
 34 static unsigned long phys_initrd_start __initdata = 0x01000000;
 35 static unsigned long phys_initrd_size __initdata = SZ_8M;
 36 
 37 static int __init early_initrd(char *p)
 38 {
 39         unsigned long start, size;
 40         char *endp;
 41 
 42         start = memparse(p, &endp);
 43         if (*endp == ',') {
 44                 size = memparse(endp + 1, NULL);
 45 
 46                 phys_initrd_start = start;
 47                 phys_initrd_size = size;
 48         }
 49         return 0;
 50 }
 51 early_param("initrd", early_initrd);
 52 
 53 /*
 54  * This keeps memory configuration data used by a couple memory
 55  * initialization functions, as well as show_mem() for the skipping
 56  * of holes in the memory map.  It is populated by uc32_add_memory().
 57  */
 58 struct meminfo meminfo;
 59 
 60 void show_mem(unsigned int filter)
 61 {
 62         int free = 0, total = 0, reserved = 0;
 63         int shared = 0, cached = 0, slab = 0, i;
 64         struct meminfo *mi = &meminfo;
 65 
 66         printk(KERN_DEFAULT "Mem-info:\n");
 67         show_free_areas(filter);
 68 
 69         for_each_bank(i, mi) {
 70                 struct membank *bank = &mi->bank[i];
 71                 unsigned int pfn1, pfn2;
 72                 struct page *page, *end;
 73 
 74                 pfn1 = bank_pfn_start(bank);
 75                 pfn2 = bank_pfn_end(bank);
 76 
 77                 page = pfn_to_page(pfn1);
 78                 end  = pfn_to_page(pfn2 - 1) + 1;
 79 
 80                 do {
 81                         total++;
 82                         if (PageReserved(page))
 83                                 reserved++;
 84                         else if (PageSwapCache(page))
 85                                 cached++;
 86                         else if (PageSlab(page))
 87                                 slab++;
 88                         else if (!page_count(page))
 89                                 free++;
 90                         else
 91                                 shared += page_count(page) - 1;
 92                         page++;
 93                 } while (page < end);
 94         }
 95 
 96         printk(KERN_DEFAULT "%d pages of RAM\n", total);
 97         printk(KERN_DEFAULT "%d free pages\n", free);
 98         printk(KERN_DEFAULT "%d reserved pages\n", reserved);
 99         printk(KERN_DEFAULT "%d slab pages\n", slab);
100         printk(KERN_DEFAULT "%d pages shared\n", shared);
101         printk(KERN_DEFAULT "%d pages swap cached\n", cached);
102 }
103 
104 static void __init find_limits(unsigned long *min, unsigned long *max_low,
105         unsigned long *max_high)
106 {
107         struct meminfo *mi = &meminfo;
108         int i;
109 
110         *min = -1UL;
111         *max_low = *max_high = 0;
112 
113         for_each_bank(i, mi) {
114                 struct membank *bank = &mi->bank[i];
115                 unsigned long start, end;
116 
117                 start = bank_pfn_start(bank);
118                 end = bank_pfn_end(bank);
119 
120                 if (*min > start)
121                         *min = start;
122                 if (*max_high < end)
123                         *max_high = end;
124                 if (bank->highmem)
125                         continue;
126                 if (*max_low < end)
127                         *max_low = end;
128         }
129 }
130 
131 static void __init uc32_bootmem_init(unsigned long start_pfn,
132         unsigned long end_pfn)
133 {
134         struct memblock_region *reg;
135         unsigned int boot_pages;
136         phys_addr_t bitmap;
137         pg_data_t *pgdat;
138 
139         /*
140          * Allocate the bootmem bitmap page.  This must be in a region
141          * of memory which has already been mapped.
142          */
143         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
144         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
145                                 __pfn_to_phys(end_pfn));
146 
147         /*
148          * Initialise the bootmem allocator, handing the
149          * memory banks over to bootmem.
150          */
151         node_set_online(0);
152         pgdat = NODE_DATA(0);
153         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
154 
155         /* Free the lowmem regions from memblock into bootmem. */
156         for_each_memblock(memory, reg) {
157                 unsigned long start = memblock_region_memory_base_pfn(reg);
158                 unsigned long end = memblock_region_memory_end_pfn(reg);
159 
160                 if (end >= end_pfn)
161                         end = end_pfn;
162                 if (start >= end)
163                         break;
164 
165                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
166         }
167 
168         /* Reserve the lowmem memblock reserved regions in bootmem. */
169         for_each_memblock(reserved, reg) {
170                 unsigned long start = memblock_region_reserved_base_pfn(reg);
171                 unsigned long end = memblock_region_reserved_end_pfn(reg);
172 
173                 if (end >= end_pfn)
174                         end = end_pfn;
175                 if (start >= end)
176                         break;
177 
178                 reserve_bootmem(__pfn_to_phys(start),
179                         (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
180         }
181 }
182 
183 static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
184         unsigned long max_high)
185 {
186         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
187         struct memblock_region *reg;
188 
189         /*
190          * initialise the zones.
191          */
192         memset(zone_size, 0, sizeof(zone_size));
193 
194         /*
195          * The memory size has already been determined.  If we need
196          * to do anything fancy with the allocation of this memory
197          * to the zones, now is the time to do it.
198          */
199         zone_size[0] = max_low - min;
200 
201         /*
202          * Calculate the size of the holes.
203          *  holes = node_size - sum(bank_sizes)
204          */
205         memcpy(zhole_size, zone_size, sizeof(zhole_size));
206         for_each_memblock(memory, reg) {
207                 unsigned long start = memblock_region_memory_base_pfn(reg);
208                 unsigned long end = memblock_region_memory_end_pfn(reg);
209 
210                 if (start < max_low) {
211                         unsigned long low_end = min(end, max_low);
212                         zhole_size[0] -= low_end - start;
213                 }
214         }
215 
216         /*
217          * Adjust the sizes according to any special requirements for
218          * this machine type.
219          */
220         arch_adjust_zones(zone_size, zhole_size);
221 
222         free_area_init_node(0, zone_size, min, zhole_size);
223 }
224 
225 int pfn_valid(unsigned long pfn)
226 {
227         return memblock_is_memory(pfn << PAGE_SHIFT);
228 }
229 EXPORT_SYMBOL(pfn_valid);
230 
231 static void uc32_memory_present(void)
232 {
233 }
234 
235 static int __init meminfo_cmp(const void *_a, const void *_b)
236 {
237         const struct membank *a = _a, *b = _b;
238         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
239         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
240 }
241 
242 void __init uc32_memblock_init(struct meminfo *mi)
243 {
244         int i;
245 
246         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
247                 meminfo_cmp, NULL);
248 
249         for (i = 0; i < mi->nr_banks; i++)
250                 memblock_add(mi->bank[i].start, mi->bank[i].size);
251 
252         /* Register the kernel text, kernel data and initrd with memblock. */
253         memblock_reserve(__pa(_text), _end - _text);
254 
255 #ifdef CONFIG_BLK_DEV_INITRD
256         if (phys_initrd_size) {
257                 memblock_reserve(phys_initrd_start, phys_initrd_size);
258 
259                 /* Now convert initrd to virtual addresses */
260                 initrd_start = __phys_to_virt(phys_initrd_start);
261                 initrd_end = initrd_start + phys_initrd_size;
262         }
263 #endif
264 
265         uc32_mm_memblock_reserve();
266 
267         memblock_allow_resize();
268         memblock_dump_all();
269 }
270 
271 void __init bootmem_init(void)
272 {
273         unsigned long min, max_low, max_high;
274 
275         max_low = max_high = 0;
276 
277         find_limits(&min, &max_low, &max_high);
278 
279         uc32_bootmem_init(min, max_low);
280 
281 #ifdef CONFIG_SWIOTLB
282         swiotlb_init(1);
283 #endif
284         /*
285          * Sparsemem tries to allocate bootmem in memory_present(),
286          * so must be done after the fixed reservations
287          */
288         uc32_memory_present();
289 
290         /*
291          * sparse_init() needs the bootmem allocator up and running.
292          */
293         sparse_init();
294 
295         /*
296          * Now free the memory - free_area_init_node needs
297          * the sparse mem_map arrays initialized by sparse_init()
298          * for memmap_init_zone(), otherwise all PFNs are invalid.
299          */
300         uc32_bootmem_free(min, max_low, max_high);
301 
302         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
303 
304         /*
305          * This doesn't seem to be used by the Linux memory manager any
306          * more, but is used by ll_rw_block.  If we can get rid of it, we
307          * also get rid of some of the stuff above as well.
308          *
309          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
310          * the system, not the maximum PFN.
311          */
312         max_low_pfn = max_low - PHYS_PFN_OFFSET;
313         max_pfn = max_high - PHYS_PFN_OFFSET;
314 }
315 
316 static inline void
317 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
318 {
319         struct page *start_pg, *end_pg;
320         unsigned long pg, pgend;
321 
322         /*
323          * Convert start_pfn/end_pfn to a struct page pointer.
324          */
325         start_pg = pfn_to_page(start_pfn - 1) + 1;
326         end_pg = pfn_to_page(end_pfn);
327 
328         /*
329          * Convert to physical addresses, and
330          * round start upwards and end downwards.
331          */
332         pg = PAGE_ALIGN(__pa(start_pg));
333         pgend = __pa(end_pg) & PAGE_MASK;
334 
335         /*
336          * If there are free pages between these,
337          * free the section of the memmap array.
338          */
339         if (pg < pgend)
340                 free_bootmem(pg, pgend - pg);
341 }
342 
343 /*
344  * The mem_map array can get very big.  Free the unused area of the memory map.
345  */
346 static void __init free_unused_memmap(struct meminfo *mi)
347 {
348         unsigned long bank_start, prev_bank_end = 0;
349         unsigned int i;
350 
351         /*
352          * This relies on each bank being in address order.
353          * The banks are sorted previously in bootmem_init().
354          */
355         for_each_bank(i, mi) {
356                 struct membank *bank = &mi->bank[i];
357 
358                 bank_start = bank_pfn_start(bank);
359 
360                 /*
361                  * If we had a previous bank, and there is a space
362                  * between the current bank and the previous, free it.
363                  */
364                 if (prev_bank_end && prev_bank_end < bank_start)
365                         free_memmap(prev_bank_end, bank_start);
366 
367                 /*
368                  * Align up here since the VM subsystem insists that the
369                  * memmap entries are valid from the bank end aligned to
370                  * MAX_ORDER_NR_PAGES.
371                  */
372                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
373         }
374 }
375 
376 /*
377  * mem_init() marks the free areas in the mem_map and tells us how much
378  * memory is free.  This is done after various parts of the system have
379  * claimed their memory after the kernel image.
380  */
381 void __init mem_init(void)
382 {
383         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
384 
385         free_unused_memmap(&meminfo);
386 
387         /* this will put all unused low memory onto the freelists */
388         free_all_bootmem();
389 
390         mem_init_print_info(NULL);
391         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
392                 "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
393                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
394                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
395                 "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
396                 "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
397                 "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
398                 "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
399 
400                 VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
401                 DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
402                 VMALLOC_START, VMALLOC_END,
403                 DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
404                 PAGE_OFFSET, (unsigned long)high_memory,
405                 DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
406                 MODULES_VADDR, MODULES_END,
407                 DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),
408 
409                 __init_begin, __init_end,
410                 DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
411                 _stext, _etext,
412                 DIV_ROUND_UP((_etext - _stext), SZ_1K),
413                 _sdata, _edata,
414                 DIV_ROUND_UP((_edata - _sdata), SZ_1K));
415 
416         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
417         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
418 
419         if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
420                 /*
421                  * On a machine this small we won't get
422                  * anywhere without overcommit, so turn
423                  * it on by default.
424                  */
425                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
426         }
427 }
428 
429 void free_initmem(void)
430 {
431         free_initmem_default(-1);
432 }
433 
434 #ifdef CONFIG_BLK_DEV_INITRD
435 
436 static int keep_initrd;
437 
438 void free_initrd_mem(unsigned long start, unsigned long end)
439 {
440         if (!keep_initrd)
441                 free_reserved_area((void *)start, (void *)end, -1, "initrd");
442 }
443 
444 static int __init keepinitrd_setup(char *__unused)
445 {
446         keep_initrd = 1;
447         return 1;
448 }
449 
450 __setup("keepinitrd", keepinitrd_setup);
451 #endif
452 

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